A big meanie. When they're kids, they like to beat up smaller children. As teenagers, they like to beat up or verbally abuse other teenagers. As adults, they either grow out of it or become wife-beaters, cops, employers, soldiers, or mean drunks.
Unfortunately, some kids who were picked on by bullies eventually grow up to become bullies themselves -- either politicians, police officers, teachers, bosses, or some other profession that lets them abuse and insult weaker people.